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How to calculate the packing specification of backpack

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How to calculate the packing specification of backpack

is it the outer package specification of the backpack, or do you want to calculate how many things can be contained in the backpack
I used to do this. It’s hard to say it clearly in one or two sentences
I’ll tell you two ways: 1 Find the master of your plank house, that is, the one who makes the paper grid. Ask him for advice with an open mind. He absolutely knows
2. Buy a book about this. It seems that there are bookstores. I don’t remember the title very clearly. It seems to be a book about backpack design and calculation methods. Go to the big bookstore and come back to study it slowly
that’s how I used to learn

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